Reads an analog input on pin 0, converts it to voltage, and prints the result to the Serial Monitor. Graphical representation is available using Serial Plotter (Tools > Serial Plotter menu).
Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground. Potentiometer analogRead()
Reads the value from the specified analog pin. Arduino boards contain a multichannel, 10-bit analog to digital converter. This means that it will map input voltages between 0 and the operating voltage(5V...

If you want to start your career in Internet of Things get Node MCU Ch340 v3 or Node MCU CP2110 Hi Geeks if you have purchased Node MCU CP2110 . That means you are on Right place. Download CP2110 Driver for Your Operating System here Next step you know just extract ->next ->agree ->continue......... Now next step to Install Node MCU ESP8266 Library and board manager. I will cover on next post.